Add SingleLineTestRunner/Result. NFC #25755
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This test runner does a few things differ the base TextTestRunner:
--bufferby also buffering/redirecting logging output that occurs during the test run.Followups that I'm a planning:
--bufferby default which will then enable this runner by default-j1to see the effect of this runner)I also updated parallel_testsuite.py use the same "XX/YY" progress rather than a percent.
See #25752, which implements similar thing in the parallel_runner. Hopefully once this change lands I can simplify #25752.